Protek 9216A, Руководство пользователя, Страница: 62 / 77

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such as taking a measurement, or auto calibration, take a long time to execute and there
is no other way of determining when they are done. The NO COMMAND bit may be read
while commands are being executed by doing a serial poll. There is no way to read this
bit over RS232. Note that using the *STB? query to read this bit will always return the
value 0 because it will always return an answer while a command is executing - the
*STB? command itself.
Definitions of Status Bytes
Serial Polling
bit name usage
0 Ready The 9216A is ready to perform a measurement
1 Not used
2 Not used
3 LCR An unmasked bit in the LCR status register has been set.
4 ESB An unmasked bit in the standard status byte has been set.
5 RQS / MSS SRQ (Service Request) bit.
6 No command There are no unexecuted commands in the input queue.
Standard Event
bit name usage
0 OPC Set by the OPC command when all measurements are complete
1 Not used
2 Query Error Set on output queue overflow (too many responses waiting to be transmitted.)
3 Not used
4 Execution err Set by an out of range parameter, or non-completion of some command due a
condition such as an incorrect operating mode.
5 Command err Set by a command syntax error, or unrecognized command
6 URQ Set by any key press
7 PON Set by power on